apache / apache/beam

Boundedness and Unboundedness as a trait of a Rel so we know during planning

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Description

Currently we do not know the boundedness or unboundedness of a collection until after planning is complete, so it cannot influence the plan. Instead, BeamJoinRel makes post-planning decisions about what sort of join to implement. We should move this into the planning phase. I think Calcite traits are the intended way to do this.

Imported from Jira [BEAM-4720](https://issues.apache.org/jira/browse/BEAM-4720). Original Jira may contain additional context.
Reported by: kenn.

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